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1200MPa-grade cold-rolled annealed dual-phase steel and production method thereof

A technology of cold-rolled annealing and production methods, which is applied in the field of cold-rolled high-strength steel plates, can solve the problems of little successful production experience and high production difficulty, and achieve the effects of good bake hardening performance and continuous yield characteristics

Inactive Publication Date: 2015-12-09
TANGSHAN IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there is little successful production experience about 1200MPa grade cold-rolled annealed dual-phase steel, mainly concentrated in laboratory research, such as the publication number CN102021483A which discloses a tensile strength 1200MPa grade cold-rolled dual-phase steel plate and its preparation method. The strength is controlled by refining grain strengthening and controlling the content of martensite; but its thickness is only 1.0mm, and for continuous annealing line production of dual-phase steel, as the thickness of the matrix increases, the production becomes more and more difficult

Method used

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Effect test

Embodiment 1

[0018] Embodiment 1: The production method of this 1200MPa grade cold-rolled annealed dual-phase steel adopts the following specific processes.

[0019] (1) Hot rolling process: the time in the furnace is 130 minutes, the soaking temperature of the slab is 1280°C, and the soaking time is 28 minutes; out of the furnace, the final rolling temperature is 875°C, the front cooling mode is adopted, and the coiling temperature is 550°C.

[0020] (2) Cold rolling annealing process: cold rolling reduction rate is 60%, the soaking temperature of the annealing step is 780°C, the rapid cooling start temperature is 630°C, the overaging temperature is 280°C, and the production process speed is 160m / min. The production process speed refers to the running speed of the steel strip in the continuous annealing furnace.

[0021] (3) Leveling process: the reduction rate is 0.5%, and a dual-phase steel with a thickness of 1.0 mm can be obtained after leveling.

Embodiment 2

[0022] Embodiment 2: The production method of the 1200MPa grade cold-rolled annealed dual-phase steel adopts the following specific processes.

[0023] (1) Hot rolling process: the time in the furnace is 120 minutes, the soaking temperature of the slab is 1280°C, and the soaking time is 30 minutes; out of the furnace, the final rolling temperature is 860°C, the front cooling mode is adopted, and the coiling temperature is 680°C.

[0024] (2) Cold rolling and annealing process: the cold rolling reduction rate is 55.0%, the soaking temperature of the annealing step is 820°C, the rapid cooling start temperature is 760°C, the overaging temperature is 300°C, and the production process speed is 125m / min.

[0025] (3) Leveling process: the reduction rate is 0.4%, and a dual-phase steel with a thickness of 1.3mm can be obtained after leveling.

Embodiment 3

[0026] Embodiment 3: The production method of the 1200MPa grade cold-rolled annealed dual-phase steel adopts the following specific processes.

[0027] (1) Hot rolling process: the time in the furnace is 128 minutes, the soaking temperature of the slab is 1275°C, and the soaking time is 32 minutes; out of the furnace, the final rolling temperature is 870°C, the front cooling mode is adopted, and the coiling temperature is 620°C.

[0028] (2) Cold rolling annealing process: cold rolling reduction rate is 50%, the soaking temperature of the annealing step is 800°C, the rapid cooling start temperature is 700°C, the overaging temperature is 260°C, and the production process speed is 105m / min.

[0029] (3) Leveling process: the reduction rate is 0.4%, and a dual-phase steel with a thickness of 1.5mm can be obtained after leveling.

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Abstract

The invention discloses1200MPa-grade cold-rolled annealed dual-phase steel and a production method thereof. The production method of the 1200MPa-grade cold-rolled annealed dual-phase steel comprises the steps of hot rolling, cold rolling and annealing, and flattening. A continuous casted billet prepared from, by mass, 0.14%-0.20% of C, 1.5%-2.0% of Mn, 0%-0.005% of S, 0%-0.010% of P, 0.2%-0.6% of Si, 0.015%-0.030% of Nb, 0.010%-0.030% of Ti, 0.030% or more of Als, 0.30%-0.70% of Cr, 0%-0.000050% of N and the balance Fe and inevitable impurities is subjected to hot rolling. The tensile strength of the dual-phase steel is over 1200 MPa, the percentage elongation after fracture of the dual-phase steel is over 6%, and the dual-phase steel has the continuous yielding property and the good bake hardening performance; the dual-phase steel can be used for manufacturing mechanical anti-collision parts and reinforcing parts and particularly can be used for manufacturing anti-collision parts and reinforcing parts of automobiles and doorsill footboards of the automobiles.

Description

technical field [0001] The invention relates to a cold-rolled high-strength steel plate, in particular to a 1200MPa grade cold-rolled annealed dual-phase steel for automobiles and a production method thereof. Background technique [0002] In order to meet the purpose of reducing the weight of the automobile body to reduce energy consumption, and at the same time ensure that the safety performance of the automobile body will not be reduced, more and more high-strength steels, especially advanced high-strength steels, are used in the design of automobile bodies. With excellent properties such as low yield strength, high tensile strength and high initial work hardening rate, it is gradually used in the production of auto parts. [0003] At present, there is little successful production experience about 1200MPa grade cold-rolled annealed dual-phase steel, mainly concentrated in laboratory research, such as the publication number CN102021483A which discloses a tensile strength 12...

Claims

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Application Information

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IPC IPC(8): C22C38/38C22C38/28C22C38/26C21D8/02
Inventor 夏明生张洪波于世川周国平刘春雨李梦英乔治明孙力杜雁冰刘立学杨丽芳关淑巧邢振环解鸽李桂兰池永清
Owner TANGSHAN IRON & STEEL GROUP
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